The Washer,lock, cataloged under National Stock Number 5310-01-491-4550, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mine Safety Appliances Company. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-491-4550 |
| Primary Part Number | 54278 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 54278 PRIMARY | Mine Safety Appliances Company (USA) |
NSN 5310-01-491-4550 is a Washer,lock, manufactured by Mine Safety Appliances Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-491-4550 has 1 manufacturer part number on file: 54278 (Mine Safety Appliances Company).
Key specifications for 54278: Special Features: WASHER LOCK, STL. 0 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.